Do you know what temperature they are (besides a bit warmer than 90 degrees)? I can certainly hold things in my hand comfortably that I wouldn't want my snakes coming into contact with on a regular basis.
He is right you know. have you measured with heat gun bet its way over the 110 mark in spots. My 100 watt ceramic made basking spot up to 110 8 inches away for my tegu. change your bedding to cyprees or exo earth imo way better for that type of setup.